After the cataclysmic bombardment of asteroids destroyed all life on planet Earth, the 250,000 survivors of humanity sought sanctuary in Apollo City on the moon. Under the authoritarian rule of Governor Edmund Sears, art, science, and literature became the sole domain of the privileged. But resistance sprouts in the form of the Underground, led by the idealist Jim Callaghan and his friends Richard Barker and Sophie Ramirez. After Sophie dies in an attempt to attack Sears' right-hand man, Sam Crawford, Jim and Richard travel through a quantum portal that takes them to a parallel Earth untouched by Doomsday. As Jim and his friends traverse other parallel universes, they discover a subatomic virus that threatens to destroy the multiverse. Will they be able to save humanity's future?